During the turnround of the British Airways jet aircraft, a refueller checks the safety of heavy fuel nozzles that connect from his bowser truck on the apron at Heathrow Airport's Terminal 5. He is ensuring the correct plugging of the connections as some 109 tons of Jet A1 aviation fuel flow at a rate of 3,000 litres a minute which is being uplifted into the wing tanks of this Boeing 747-300, a typical quantity of extra fuel for this aeroplane bound for Los Angeles. From writer Alain de Botton's book project "A Week at the Airport: A Heathrow Diary" (2009). .